“Imagine that one day someone hit himself lightly on the head with a parsnip. Instead of stopping (for this is a foolish thing to do) he carried on doing it. When he eventually did stop he went about his business but discovered, much to his surprise, that he had a sudden unconquerable urge to hit himself lightly on the head with a parsnip all over again. So he did. And the more he did it, the more he needed to do it. The act of doing it gave him a tiny surge of joy, a little rush of pleasure that had to be elicited, never mind what a twazzock he looked, parsnipping himself on the head all day.”
This message was brought to you by Stephen Fry and his wonderful blog. Warning, entries are long, and take a while to read.